package ui.jedit;

/*
 * CTokenMarker.java - C token marker
 * Copyright (C) 1998, 1999 Slava Pestov
 *
 * You may use and modify this package for any purpose. Redistribution is
 * permitted, in both source and binary form, provided that this notice
 * remains intact in all source distributions of this package.
 */

import javax.swing.text.Segment;

/**
 * C token marker.
 * 
 * @author Slava Pestov
 * @version $Id: CTokenMarker.java,v 1.34 1999/12/13 03:40:29 sp Exp $
 */
public class CTokenMarker extends TokenMarker {
    public CTokenMarker() {
        this(true, getKeywords());
    }

    public CTokenMarker(boolean cpp, KeywordMap keywords) {
        this.cpp = cpp;
        this.keywords = keywords;
    }

    public byte markTokensImpl(byte token, Segment line, int lineIndex) {
        char[] array = line.array;
        int offset = line.offset;
        lastOffset = offset;
        lastKeyword = offset;
        int length = line.count + offset;
        boolean backslash = false;

        loop: for (int i = offset; i < length; i++) {
            int i1 = (i + 1);

            char c = array[i];
            if (c == '\\') {
                backslash = !backslash;
                continue;
            }

            switch (token) {
            case Token.NULL:
                switch (c) {
                case '#':
                    if (backslash)
                        backslash = false;
                    else if (cpp) {
                        if (doKeyword(line, i, c))
                            break;
                        addToken(i - lastOffset, token);
                        addToken(length - i, Token.KEYWORD2);
                        lastOffset = lastKeyword = length;
                        break loop;
                    }
                    break;
                case '"':
                    doKeyword(line, i, c);
                    if (backslash)
                        backslash = false;
                    else {
                        addToken(i - lastOffset, token);
                        token = Token.LITERAL1;
                        lastOffset = lastKeyword = i;
                    }
                    break;
                case '\'':
                    doKeyword(line, i, c);
                    if (backslash)
                        backslash = false;
                    else {
                        addToken(i - lastOffset, token);
                        token = Token.LITERAL2;
                        lastOffset = lastKeyword = i;
                    }
                    break;
                case ':':
                    if (lastKeyword == offset) {
                        if (doKeyword(line, i, c))
                            break;
                        backslash = false;
                        addToken(i1 - lastOffset, Token.LABEL);
                        lastOffset = lastKeyword = i1;
                    } else if (doKeyword(line, i, c))
                        break;
                    break;
                case '/':
                    backslash = false;
                    doKeyword(line, i, c);
                    if (length - i > 1) {
                        switch (array[i1]) {
                        case '*':
                            addToken(i - lastOffset, token);
                            lastOffset = lastKeyword = i;
                            if (length - i > 2 && array[i + 2] == '*')
                                token = Token.COMMENT2;
                            else
                                token = Token.COMMENT1;
                            break;
                        case '/':
                            addToken(i - lastOffset, token);
                            addToken(length - i, Token.COMMENT1);
                            lastOffset = lastKeyword = length;
                            break loop;
                        }
                    }
                    break;
                default:
                    backslash = false;
                    if (!Character.isLetterOrDigit(c) && c != '_')
                        doKeyword(line, i, c);
                    break;
                }
                break;
            case Token.COMMENT1:
            case Token.COMMENT2:
                backslash = false;
                if (c == '*' && length - i > 1) {
                    if (array[i1] == '/') {
                        i++;
                        addToken((i + 1) - lastOffset, token);
                        token = Token.NULL;
                        lastOffset = lastKeyword = i + 1;
                    }
                }
                break;
            case Token.LITERAL1:
                if (backslash)
                    backslash = false;
                else if (c == '"') {
                    addToken(i1 - lastOffset, token);
                    token = Token.NULL;
                    lastOffset = lastKeyword = i1;
                }
                break;
            case Token.LITERAL2:
                if (backslash)
                    backslash = false;
                else if (c == '\'') {
                    addToken(i1 - lastOffset, Token.LITERAL1);
                    token = Token.NULL;
                    lastOffset = lastKeyword = i1;
                }
                break;
            default:
                throw new InternalError("Invalid state: " + token);
            }
        }

        if (token == Token.NULL)
            doKeyword(line, length, '\0');

        switch (token) {
        case Token.LITERAL1:
        case Token.LITERAL2:
            addToken(length - lastOffset, Token.INVALID);
            token = Token.NULL;
            break;
        case Token.KEYWORD2:
            addToken(length - lastOffset, token);
            if (!backslash)
                token = Token.NULL;
        default:
            addToken(length - lastOffset, token);
            break;
        }

        return token;
    }

    public static KeywordMap getKeywords() {
        if (cKeywords == null) {
            cKeywords = new KeywordMap(false);
            cKeywords.add("char", Token.KEYWORD3);
            cKeywords.add("double", Token.KEYWORD3);
            cKeywords.add("enum", Token.KEYWORD3);
            cKeywords.add("float", Token.KEYWORD3);
            cKeywords.add("int", Token.KEYWORD3);
            cKeywords.add("long", Token.KEYWORD3);
            cKeywords.add("short", Token.KEYWORD3);
            cKeywords.add("signed", Token.KEYWORD3);
            cKeywords.add("struct", Token.KEYWORD3);
            cKeywords.add("typedef", Token.KEYWORD3);
            cKeywords.add("union", Token.KEYWORD3);
            cKeywords.add("unsigned", Token.KEYWORD3);
            cKeywords.add("void", Token.KEYWORD3);
            cKeywords.add("auto", Token.KEYWORD1);
            cKeywords.add("const", Token.KEYWORD1);
            cKeywords.add("extern", Token.KEYWORD1);
            cKeywords.add("register", Token.KEYWORD1);
            cKeywords.add("static", Token.KEYWORD1);
            cKeywords.add("volatile", Token.KEYWORD1);
            cKeywords.add("break", Token.KEYWORD1);
            cKeywords.add("case", Token.KEYWORD1);
            cKeywords.add("continue", Token.KEYWORD1);
            cKeywords.add("default", Token.KEYWORD1);
            cKeywords.add("do", Token.KEYWORD1);
            cKeywords.add("else", Token.KEYWORD1);
            cKeywords.add("for", Token.KEYWORD1);
            cKeywords.add("goto", Token.KEYWORD1);
            cKeywords.add("if", Token.KEYWORD1);
            cKeywords.add("return", Token.KEYWORD1);
            cKeywords.add("sizeof", Token.KEYWORD1);
            cKeywords.add("switch", Token.KEYWORD1);
            cKeywords.add("while", Token.KEYWORD1);
            cKeywords.add("asm", Token.KEYWORD2);
            cKeywords.add("asmlinkage", Token.KEYWORD2);
            cKeywords.add("far", Token.KEYWORD2);
            cKeywords.add("huge", Token.KEYWORD2);
            cKeywords.add("inline", Token.KEYWORD2);
            cKeywords.add("near", Token.KEYWORD2);
            cKeywords.add("pascal", Token.KEYWORD2);
            cKeywords.add("true", Token.LITERAL2);
            cKeywords.add("false", Token.LITERAL2);
            cKeywords.add("NULL", Token.LITERAL2);
        }
        return cKeywords;
    }

    // private members
    private static KeywordMap cKeywords;

    private boolean cpp;
    private KeywordMap keywords;
    private int lastOffset;
    private int lastKeyword;

    private boolean doKeyword(Segment line, int i, char c) {
        int i1 = i + 1;

        int len = i - lastKeyword;
        byte id = keywords.lookup(line, lastKeyword, len);
        if (id != Token.NULL) {
            if (lastKeyword != lastOffset)
                addToken(lastKeyword - lastOffset, Token.NULL);
            addToken(len, id);
            lastOffset = i;
        }
        lastKeyword = i1;
        return false;
    }
}
